发明授权
- 专利标题: Optical fiber cable
- 专利标题(中): 光纤电缆
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申请号: US09086407申请日: 1998-05-29
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公开(公告)号: US06208785B1公开(公告)日: 2001-03-27
- 发明人: Hiroki Ishikawa , Yoshiyuki Suetsugu
- 申请人: Hiroki Ishikawa , Yoshiyuki Suetsugu
- 优先权: JP9-140010 19970529
- 主分类号: G02B644
- IPC分类号: G02B644
摘要:
An optical fiber cable is constituted by a cylindrical spacer having on its surface helical grooves reversing their direction at a given pitch in which a stack of ribbon optical fibers is received. In the optical fiber cable, the reverse angle ø of the groove is 210°≦ø≦330°; the groove has a size to contain a virtual circle therein whose diameter D is represented by equation of D=(W2+(N·T)2)½ where W is the width of the ribbon optical fiber, T is the thickness of the ribbon optical fiber, and N is the number of the ribbon optical fibers stacked in a groove; the angle &thgr; formed between each of side walls of the groove and a line connecting the center of the bottom of the groove and the center of the spacer varies periodically; and the angle &thgr; of the side wall on the inner side of the curvature of the center of the groove increases continuously and monotonously at least over the part extending from a position distant from a helical portion between adjacent reverse portions at approximately 90° in a circumferential direction to the next reverse portion.